label: The format string for the bluetooth widget. Displays the bluetooth icon.
label_alt: The alternative format string for the bluetooth widget. Displays list of connected devices.
tooltip: Whether to show the tooltip on hover.
icons: A dictionary specifying the icons for the bluetooth widget. The keys are bluetooth_on, bluetooth_off, and bluetooth_connected, and the values are the unicode characters for the icons.
callbacks: A dictionary specifying the callbacks for mouse events. The keys are on_left, on_middle, and on_right, and the values are the names of the callback functions.
animation: A dictionary specifying the animation settings for the widget. It contains three keys: enabled, type, and duration. The type can be fadeInOut and the duration is the animation duration in milliseconds.